Quick change spindle adapter or chuck

ABSTRACT

A quick holding chuck, generally according to the device shown in FIGS. 4 and 5 of the U.S. Patent to Bilz No. 3,473,815 of Oct. 21, 1969, but improved in the provision of a spring holding plate between an enlarged head of the side set screw and the chuck shank.

mite States atent Smith l lMalch 13, 1973 QUlCK CHANGE SPlNDLE ADAPTER0R CHUCK Inventor:

Detroit, Mich. 48227 Filed: July 19, 1971 Appl. N0.: 163,946

US. Cl. ..279/82, 279/] B Int. Cl. ..B23b 31/04 Field of Search..279/82, 1 B, 83, 79, 75

References Cited UNITED STATES PATENTS 10/l 969 Bilz ..279/82 TheodoreM. Smith, 14750 Puritan,

3,672,692 6/1972 Fauth ..279/82 Primary Examiner-Andrew R. JuhaszAssistant Examiner-Z. R. Bilinsky AttorneyDaniel G. Cullen eta].

A quick holding chuck, generally according to the device shown in FIGS.4 and 5 of the US. Patent to Bilz No. 3,473,815 of Oct. 21, 1969, butimproved in the provision of a spring holding plate between an enlargedhead of the side set screw and the chuck shank.

ABSTRACT 1 Claim, 5 Drawing Figures PATENTEDMAMBIQH 3,720,417

FIGS

INVENTOR- THEODORE M. SMITH ATTO RN EYS QUICK CHANGE SPINDLE ADAPTER ORCHUCK BACKGROUND U.S. Pat. No. 3,473,815 shows a quick change chuckwherein a set screw 17 locks a locking sleeve 22 to a tubular chuckshank l, with the screw passing through aligned clear holes 18 and 19 ofa control shell 3 and the sleeve 22, and threading into a tapped hole ofthe shank l. The head of the screw is exposed through hole 18 in anouter control shell 3. The screw fits snugly in hole 19 of sleeve 22 andthus anchors the sleeve 22 against relative longitudinal movement withrespect to the chuck shank I. To effect such anchoring, it is requiredthat the hole 19 in the sleeve 22 be located extremely accurately withrespect to the threaded hole in the shank l which receives the screw 17for accurate registry and alignment of the parts.

In U.S. Pat. No. 3,473,815, the locking action provided by the screw isspread over an extremely small area. Consequently, screws in use oftenbecame loose and became disconnected, causing a malfunction or damage tothe parts or the entire assembly. Often times the set screws wouldbecome loose and lost. Often times there existed play between the shankand the tool within it and under the thus created strenuous torqueconditions, the locking screws were placed under great stress,increasing the difficulties arising from the use of set screws forlocking.

THE INVENTION The present invention employs, in addition to a retainingor locking screw, an elongated and enlarged spring bearing or retainingplate, formed to be arcuate in cross section longitudinally as well astransversely. Such retaining plate is adapted to engage the outsidesurface of the shank for frictionally gripping the shank throughout theentire perimeter of the retainer plate and thus enhance the anchoringaction provided by the set screw.

In addition, the retainer plate fills the enlarged hole in the lockingsleeve so that the plate edge holds such sleeve locked in positionrelative to the shank.

THE DRAWING A preferred embodiment of the invention is shown in theappended drawing. In this drawings:

FIG. 1 is a longitudinal cross sectional view of the parts in assembly.

FIG. 2 is a transverse fragmentary exploded view with parts partly insection.

FIG. 3 is a fragmentary plan view.

FIG. 4 is a section as if on line 4--4 of FIG. 3.

FIG. 5 is a section as if on line 5-5 of FIG. 3.

DETAILED DESCRIPTION It will be understood at the outset that most ofthe parts shown in the drawing hereof are the same in structure andfunction as the corresponding parts of FIGS. 4 and 5 of the Bilz U.S.Pat. No. 3,473,815 and accordingly, except for a brief reference tothese old parts, attention will be directed immediately to the novelfeatures of the present invention.

Hence, it may be stated at the outset, that the device is a quick changechuck and comprises a cylindrical hollow shank 1 having a tubular wall,splined at 13,

receiving a tool receiving socket 2 axially slidable within the shankand adapted to receive a tool. At the open end of the socket 2 is aholding nut 4. A locking sleeve 22 controls ball grip 6 for the nut 4,threaded onto tool holding socket 2. Nut 4 is locked to socket 2 by setscrew 25.

Outside sleeve 22, stressed by spring 7, held by stop ring 8, is aslidable control shell 3, which normally retains balls 6 in nut lockingposition and is manipulated for unlocking the nut and connected socket.

A radial set screw 17 threads through clear holes 29-39 of the lockingsleeve 22 and shell 3 and into a tapped hole 28 of the shank 1 forlocking the sleeve 22 and the shank l relatively. The head of the screwis accessible through the hole 39 in the manual control shell 3.

The improvements hereof are as follows: the screw 17 has its head 32enlarged; the holes 29 and 39 are considerably larger in area than theenlarged head 32 of the screw 17; an oval, centrally apertured, largespring plate or retainer plate 30 is placed between the enlarged head 32of the screw 17 and the shank 1 and bears around its perimeter againstthe shank; the plate 30 is normally arcuate in cross section when viewedtransversely as well as longitudinally.

When the screw 17 is threaded down snugly through the retainer plate 30and into the shank l, the retainer plate is flattened and helps anchorthe parts against accidental dislodgment.

Plate 30 also provides a larger surface area of bearing namely, theperimeter of the plate 30 bearing against the wall of hole 29 of sleeve22. When the plate 30 is so flattened, head 32 of screw 17 is withinslot or hole 39 of shell 3, as shown in FIG. 1, to permit reciprocationof the shell 3.

With this construction there can be tolerated inaccuracies of alignmentof the axes of the tapped hole 28, and the holes 29 and 39 of the parts,and great accuracy of spacing of the various parts is no longerrequired.

Now having described the chuck herein disclosed, reference should be hadto the claim which follows.

I claim:

1. In a quick change chuck ofa known type, comprising a cylindricalhollow shank having a tubular wall; a tool receiving socket axiallyslidable within said shank and adapted to receive a tool; a holding nutfor and at the open end of said socket and locked to the socket; alocking sleeve; a ball grip at the nut and the open end of the lockingsleeve; a spring biased slidable control shell outside the lockingsleeve; a radial set screw locking the locking sleeve and the shankrelatively and threading into the shank through aligned holes in thelocking sleeve and the control shell for providing access to the head ofthe set screw;

the improvement which comprises said screw having its head enlarged;said holes being considerably larger in area than the enlarged head ofthe screw, and a centrally apertured spring plate between the enlargedhead of the screw and the shank and bearing against the shank; saidplate, when compressed by threading the screw home, filling the openingof the locking sleeve to block it against movement relative to theshank, and holding the screw firmly in home position; and locating andholding the screw head within the enlarged opening of the control shell,which opening is enough larger than the screw head to permit thenecessary reciprocation of said shell, without interference from thescrew head.

1. In a quick change chuck of a known type, comprising a cylindricalhollow shank having a tubular wall; a tool receiving socket axiallyslidable within said shank and adapted to receive a tool; a holding nutfor and at the open end of said socket and locked to the socket; alocking sleeve; a ball grip at the nut and the open end of the lockingsleeve; a spring biased slidable control shell outside the lockingsleeve; a radial set screw locking the locking sleeve and the shankrelatively and threading into the shank through aligned holes in thelocking sleeve and the control shell for providing access to the head ofthe set screw; the improvement which comprises said screw having itshead enlarged; said holes being considerably larger in area than theenlarged head of the screw, and a centrally apertured spring platebetween the enlarged head of the screw and the shank and bearing againstthe shank; said plate, when compressed by threading the screw home,filling the opening of the locking sleeve to block it against movementrelative to the shank, and holding the screw firmly in home position;and locating and holding the screw head within the enlarged opening ofthe control shell, which opening is enough larger than the screw head topermit the necessary reciprocation of said shell, without interferencefrom the screw head.